Electric switch



K. KNUDSEN.

ELECTRIC SWITCH.

APPLICATIONTILED NOV. 11, 1918.

Patented Man 1, 1921.

2 SHEETSSHEET I.

I INVENTOR MZTnwdse/v ATTOR/VJS K. KNUDSEN.

ELECTRIC SWITCH.

APPLICATION FILED NOV. 11, 1918.

Patented Mar. 1, .1921.

2 SHEETS-SHEET 2.

A TTOR/VEYS mrgofsm'rss PATENT orrlca xnunxnnnsnn, or rLAn ILLE, CONNECTICUT, ASSIGNOR TO. THE TRUMBULL ELECTRIC MANUFACTURING COMPANY, OF PLAINVILLE, CONNECTICUT, A COR PORAFIION OF CONN ECTICUT.

ntno'rnro swrrcn.

T 0 all w k007i, it may concern:

Be it known that I, KNUD KNUDsEN, a

subject of the King of Denmark, (signified intention of becoming acitizen of the United States andtaken out first papersand applied for second,) residing at'Plainville, Connecticut, have invented a newand useful Electric Switch, of which the following is a specification.

The present invention relates to electric switches and the objects of the invention are .stop and frictionally hold the switch in a predetermined position.-

The various features of the invention and details of construction, etc., will all appear as the specification proceeds and will be more fully understood fromconsideration of the accompanying drawing which illustrates the invention as embodied in a concrete,

' practical form.

. In said drawing Figure 1, is a front elevation of an in closed or safety switch embodying the features of the invention, certain parts being shown asbroken away for the sake of greater clearness.

Fig. 2, is a broken side elevation of the same. In these first two views, the switch is shown in the closed position and in Fig. 2

the open circuit position of the parts is indicated in dottedlines.

Figs. 3 and 4 are detail views showing the Specification of Letters Patent.

Patented Mar. 1, 1921.

' Application filed November 11, 1918. Serial No. 262,037.

This handle is pivotally supported by having a hub portion 9 journaled in the side wall of the box or casing 10 which incloses the switch parts, the arm 7 being shown as directly engaged with this hub portion within the box. v

The stop mechanism is carried by the two cooperating disk members 11 and 12 carried I by the handle and the adjacent side wall of the box respectively. on the inside face of the disk 11 on the handle are provided a pair of outstanding inclined cams or stop shoulders 13, disposed at opposite sides of the center of pivotal support of the handle and arranged to cooperate withv these inclined cams are a pair of relatively stationary reversely inclined cams 14 on the opposing face of the relatively stationary disk member '12. Y

In the switch illustrated, the cooperating stop cams are so disposed that in the closed position of the switch they will be entirely free of each other and so that they will become engaged and interlock as the switch is fully opened. The switch is'thrown to its open position in the present disclosure by means of a spring 15 connected with theopcrating-arm 7 at one end and anchored to a relatively stationarysupport 16 at its opposite end. This spring serves to open the brings the switch parts to rest without too sudden a ar and holds the switch parts in such open position, preventing any rebound or movement in a switch closing direction.

T he switch parts will remain in this open position until sufiicient force is exerted on the handle to overcomethe friction of the inclined cams. This prevents accidental movement of the switch in a closing direction which otherwise might occur from excessive vibrations or the like.

The switch is usually provided with a latch such as that indicated at 17 for securing it in the closed position. With such a construction the spring" 15 is made of sufficient tension to snap the switch quickly open when this latch is released. With this construction therefore, the switch is positively held in the closed circuit condition and furthermore when opened is firmly held in that position. Improper or accidental operation of the switch is therefore positively as cam faces, and an operating handle member guarded against. The latch for holding the switch closed .may be controlled by a no-- voltage or low-voltage release magnet, such as indicated at 18.

I'claim:

1. In an electric switch,'the combination of a movable switch element,an operating handle therefor, a disk. member carried by said .handle, .a relatively stationary disk member opposed to said disk on the handle and cooperating reversely inclined stop;

cams on the opposed faces of said disk members.

2. In an electric switch, the combinationof a box, an annular member carriedv by the side of the box having a laterally extending cam face, and a switch opera-ting handle.

having a hub journaled in said'annular member and having a cam face adapted to cooperate with the said annular member to frictionally retard the opening movement of the switch and hold circuit position.

. 3. In an inclosed switch, the combination of a box, a movable switch element in the box, an external operating handle having a hub extending through the side of the box and an inclined cam face, and a reversely inclined cam member carried by the side of the box around said hub, said inclined cam members being adapted to co-act to frictionally check the opening movement of the switch. 4

4. In an inclosed switch, an annular bearing member having a plurality of inclined relatively stationary reversely inclined the parts in the open.

having a hub portion journaled in said bearing member and havingreversely inclined cam faces co-actmg with the cam faces 0f Said bearing member for the purpose described.

5. In an inclosed switch, a switch'member movable therein, a bearing'member secured to the'side of the box, and an external operatinghandle journaled in said bearing member and connected to operate said switchmember, said handle and said bearing member having cooperating reversely inclined stop shoulders.

6. In anfelectric switch, the'combination stationary and pivoted switch members mounted thereon, a box inclosing said base and switch members, an operating handle mounted 1n said box and having connect on with said movable switch member, and

means for frictionally stopping theopeni'ng movement of the operating handle, saidv means consisting of an inclined carried by projection the box and a reversely inclined projection carried by'the operating handle to engage the projection carried bythe box when the switch is thrown to open position.

KNUD KNUDSEN.

7. In an inclosed switch, a-base having an op 

